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Loans and Leases - Summary of Loans and Leases by Segment (Detail) - USD ($)
$ in Thousands
Dec. 31, 2025
Dec. 31, 2024
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Loans and Leases $ 56,597,110 $ 52,505,168
Commercial portfolio    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Loans and Leases 45,230,196 42,068,001
Commercial portfolio | Funds held in escrow    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Loans and Leases 20,405,237 18,037,942
Commercial portfolio | Accounts receivable    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Loans and Leases 1,231,231 1,404,007
Commercial portfolio | Prepaid expenses    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Loans and Leases 15,326,007 14,492,436
Commercial portfolio | Total other assets    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Loans and Leases 7,008,839 6,898,600
Commercial portfolio | Equipment financing    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Loans and Leases 1,258,882 1,235,016
Consumer portfolio    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Loans and Leases 11,366,914 10,437,167
Consumer portfolio | Residential    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Loans and Leases 9,599,577 8,853,669
Consumer portfolio | Home equity    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Loans and Leases 1,370,513 1,427,692
Consumer portfolio | Other consumer    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Loans and Leases $ 396,824 $ 155,806